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A168255 n appears n-th nonprime number times. 1
1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

n appears A018252(n) times.

LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..1000

MATHEMATICA

Module[{nn=20, npn}, npn=Select[Range[nn], !PrimeQ[#]&]; Table[#[[2]], #[[1]]]&/@ Thread[{npn, Range[Length[npn]]}]]//Flatten (* Harvey P. Dale, Dec 19 2021 *)

CROSSREFS

Sequence in context: A090532 A003058 A000194 * A097429 A100617 A076471

Adjacent sequences: A168252 A168253 A168254 * A168256 A168257 A168258

KEYWORD

nonn,easy,less

AUTHOR

Jaroslav Krizek, Nov 21 2009

STATUS

approved

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Last modified March 22 14:53 EDT 2023. Contains 361430 sequences. (Running on oeis4.)